642000136 has 16 divisors (see below), whose sum is σ = 1218988800. Its totient is φ = 316936464.

The previous prime is 642000131. The next prime is 642000157. The reversal of 642000136 is 631000246.

It is not an unprimeable number, because it can be changed into a prime (642000131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507280 + ... + 508543.

It is an arithmetic number, because the mean of its divisors is an integer number (76186800).

Almost surely, 2^642000136 is an apocalyptic number.

It is an amenable number.

642000136 is a deficient number, since it is larger than the sum of its proper divisors (576988664).

642000136 is a wasteful number, since it uses less digits than its factorization.

642000136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015908 (or 1015904 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 642000136 is about 25337.7216023856. The cubic root of 642000136 is about 862.6706845846.

The spelling of 642000136 in words is "six hundred forty-two million, one hundred thirty-six", and thus it is an aban number.